Medical dental grinding apparatus

ABSTRACT

A medical dental grinding apparatus comprises an apparatus body, wherein an air pipeline, a clamping mechanism, and a grinding mechanism are provided in the apparatus body; the air pipeline includes an air inlet pipeline, an air outlet pipeline, and a U-shaped connection pipeline; a silencer is connected to an upper port of the air outlet pipeline; a plane where the air pipeline is located is perpendicular to a plane where the clamping mechanism is located, and the grinding mechanism is provided below the air pipeline. According to the present invention, the grinding mechanism is driven by high-pressure air in the air pipeline to operate, so that a hidden danger of electric leakage caused by using an electric apparatus in a fragile oral environment is avoided; and a steel wire is fixed by means of the clamping mechanism, so that the grinding safety is ensured.

This application is a continuation-in-part of International ApplicationNo. PCT/CN2020/109905 filed on 19 Aug. 2020 which designated the U.S.and claims priority to Chinese Application No. CN201911181473.5 filed on27 Nov. 2019, the entire contents of each of which are herebyincorporated by reference.

TECHNICAL FIELD

The present invention relates to the technical field of medicalinstruments, and specifically, to a medical dental grinding apparatus.

BACKGROUND

A brace, also known as an orthodontic brace or a dental brace, is anapparatus used in orthodontics, is configured to align teeth to anappropriate occlusal position, and for improving malocclusions,including underbites, overbites, maxillary crossbites, open bites,crooked teeth or various other flaws of the teeth and jaw. The purposeof the brace is cosmetic or structural adjustment of the teeth. Thebrace is generally used in conjunction with other orthodonticapparatuses to widen a palate or a lower jaw and to produce a spacebetween the teeth, or to change the appearance of the teeth and jaws.The existing brace types generally may be divided into: conventionalsteel braces, lingual braces (invisible braces), ceramic braces, braceswithout braces, self-ligating braces (steel self-ligating and ceramicself-ligating), and the like, where the steel braces are most widelyused due to high cost performance. However, during use of the steelbraces, the steel braces are generally secured in cooperation with steelwires, but because a notch of the steel wire is too sharp and isdifficult to process, when the steel wire is used in the oral cavity, itis very easy to hurt soft tissue inside an oral cavity and cause certainharm to the oral cavity.

Therefore, to solve the problem, the invention of a medical dentalgrinding apparatus for grinding a metal brace or a main steel wire notchhas a positive significance. Moreover, at present, such a medical dentalgrinding apparatus has not been reported.

SUMMARY

The purpose of the present invention is to provide a medical dentalgrinding apparatus for solving the problems above, so that the problemof oral soft tissue injury caused by a too sharp notch of a metal braceor steel wire is solved, and the problem of secondary injury of softtissue inside an oral cavity is avoided by grinding the notch.

To achieve the purpose above, the present invention provides thefollowing technical solution: a medical dental grinding apparatus,including an apparatus body, where the interior of the apparatus body isof a hollow structure, an upper end surface of the apparatus body issymmetrically provided with two holes, and a lower end surface isdesigned as an opening; an air pipeline, a clamping mechanism, and agrinding mechanism are provided in the apparatus body; a clamping portof the clamping mechanism extends out of the apparatus body through theopening of a lower end of the apparatus body; the grinding mechanism islocated on the opening of the lower end inside the apparatus body; theair pipeline includes an air inlet pipeline, an air outlet pipeline, anda U-shaped connection pipeline; lower ports of the air inlet pipelineand the air outlet pipeline are respectively fixedly connected to twoports of the U-shaped connection pipeline, and upper ports respectivelypenetrate through a hole on the upper end surface of the apparatus bodyto extend out of the apparatus body; an upper port of the air outletpipeline is provided with an external thread and a silencer isthreadedly connected to the upper port of the air outlet pipeline; aplane where the air pipeline is located is perpendicular to a planewhere the clamping mechanism is located; the grinding mechanism includesa turbine fan rotatably provided inside the U-shaped connection pipelineand a plurality of grinding heads in transmission connection with theturbine fan; the grinding heads are all located below the U-shapedconnection pipeline; and when the clamping mechanism clamps a notch partto be ground, the clamping port thereof corresponds to a position of thegrinding head.

The silencer includes an inner pipeline and an outer pipeline; the innerpipeline and the outer pipeline are integrally formed; the innerpipeline includes an air inlet I and a pipeline I; the outer pipelineincludes an air inlet II, a pipeline II, and an air outlet; the pipelineI is inserted into the pipeline II through the air inlet II; a pluralityof air holes are provided on the pipeline I, and the interior of theinner pipeline is communicated with the interior of the outer pipelinethrough the plurality of air holes; an outer diameter of the pipeline Iis adapted to an inner diameter of the air inlet II, and an innerdiameter of the air inlet I is larger than that of the air inlet II; aninternal thread is provided on the air inlet I, and is adapted to theexternal thread at the upper port of the air outlet pipeline.

The clamping mechanism includes a clamping part and a movable partfixedly connected to the clamping part; the clamping part includes aclamping body I, a clamping body II, and a hinge shaft; the hinge shaftpenetrates through one end of the clamping body I and one end of theclamping body II, and both ends of the hinge shaft are fixed to an innerwall of the apparatus body; the movable part includes a movable rod Iand a movable rod II; a lower end of the movable rod I is fixedlyconnected to the clamping body I, and a lower end of the movable rod IIis fixedly connected to the clamping body II; push rods penetratingthrough and extending out of the apparatus body are both fixedlyconnected to upper ends of the movable rod I and the movable rod II; andthe movable rod I is elastically connected to the movable rod II bymeans of a spring.

A bump is provided at one end of the clamping body I connected to thehinge shaft, and a groove adapted to the bump is provided at one end ofthe clamping body II connected to the hinge shaft; the bump is providedwith a through hole I, and two sidewalls of the groove arecorrespondingly provided with through holes II; when the clamping body Iand the clamping body II are mounted in a matching mode, the throughhole I and the through holes II are coaxial, the hinge shaft penetratesthrough the through hole I and the through holes II, and both ends ofthe hinge shaft are fixed to the inner wall of the apparatus body;limiting blocks are fixedly provided on the hinge shaft and are locatedon two sides of the groove on the clamping body II; and a diameter ofthe limiting block is larger than that of the through hole II.

A port at one end of the clamping body I away from the hinge shaft and aport at one end of the clamping body II away from the hinge shaft areboth arc-shaped; an elastomer is provided on an arc-shaped inner side ofthe port, and is a sponge or rubber; the spring under a natural stateenables the clamping body I and the clamping body II to be close to eachother; the clamping body I and the clamping body II are both arc-shapedand are annular when the clamping body I and the clamping body II areclosed; the clamping body I and the clamping body II are symmetricallyarranged; and when the clamping body I and the clamping body II areclosed, the ports, away from the hinge shaft, of the clamping body I andthe clamping body II are closed to form an elliptical or circularthrough hole.

The hinge shaft is located in a U-shaped opening of the U-shapedconnection pipeline, and one end of the clamping body I and one end ofthe clamping body II that are away from the hinge shaft are locatedbelow the U-shaped connection pipeline.

The grinding mechanism includes the turbine fan, a gear transmissionassembly, and the plurality of grinding heads; the turbine fan isrotatably provided on the inner bottom of the U-shaped connectionpipeline, a main rotating shaft is connected to a lower portion of theturbine fan, and a lower end of the main rotating shaft penetratesthrough the U-shaped connection pipeline to be connected to the geartransmission assembly; the gear transmission assembly includes a gear I,two gears II meshed with the gear I and uniformly distributed along aperipheral side of the gear I, two bevel gears I, and two bevel gears IIfixed in the apparatus body by means of fixing rods and respectivelymeshed with the bevel gears I; an upper end of the gear I is connectedto the main rotating shaft, a rotating rod is fixedly connected to alower end, and a grinding head I is fixedly mounted at a bottom end ofthe rotating rod, is a concave grinding head, and is provided with adust-storage hole; lower ends of the gears II are both connected to thebevel gears I by means of rotating shafts; the bevel gears I are meshedwith the bevel gears II; the bevel gear II has an end rotatablyconnected to the fixing rod fixed in the apparatus body, and the otherend fixedly connected to a grinding head rod; a top end of the grindinghead rod is provided with a grinding head II, a radius of a top end ofthe grinding head II is smaller than a root radius thereof, and the topend of the grinding head II is provided with a dust-storage hole; andthe grinding head II is located 0.2-0.5 mm below the grinding head I.

A central axis of the rotating rod is parallel to that of the rotatingshaft, and an included angle of 60-80° is formed between the centralaxis of the rotating shaft and a central axis of the correspondinggrinding head rod.

Compared with the prior art, the beneficial effects of the presentinvention are as follows: the medical dental grinding apparatus isprovided; the turbine fan is driven by high-pressure air entering theair pipeline to rotate, so that power is provided for the geartransmission assembly to drive the grinding head to work, and a hiddendanger of electric leakage caused by using an electric apparatus in afragile oral environment is avoided; a steel wire is fixed by means ofthe clamping mechanism during use of the apparatus of the presentinvention, so that the grinding safety is ensured, and precise grindingis implemented; the concave grinding head I and the plurality ofgrinding heads II may effectively remove a sharp cross section on thenotch of the steel wire in different directions, so that oral health ofa user is protected; when an airflow flows out through the air outletpipeline, the airflow needs to flow into the interior of the outerpipeline through the air holes uniformly distributed on the pipeline I,the configuration of the air holes implements a turbulent effect on aflow direction of the airflow entering the pipeline I, and the airflowis prevented from rushing, so that noise is greatly reduced. The presentinvention is simple in structure, high in maneuverability, and suitablefor grinding a notch of a metal brace or main steel wire in an oralcavity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a medical dental grinding apparatus accordingto the present invention;

FIG. 2 is a left view of a medical dental grinding apparatus accordingto the present invention;

FIG. 3 is a schematic structural diagram of a silencer 5 according toFIG. 1 of the present invention;

FIG. 4 is a schematic structural diagram of mounting among a clampingbody I 31, a clamping body II 32, and a hinge shaft 33 according to thepresent invention; and

FIG. 5 is a schematic structural diagram of a grinding mechanism 4according to FIG. 1 of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

1—apparatus body; 2—air pipeline; 21—air inlet pipeline; 22—air outletpipeline; 23—U-shaped connection pipeline; 3—clamping mechanism;31—clamping body I; 32—clamping body II; 33—hinge shaft; 331—limitingblock; 34—movable rod I; 35—movable rod II; 36—push rod; 37—spring;4—grinding mechanism; 41—turbine fan; 411—main rotating shaft; 42—gearI; 421—rotating rod; 43—gear II; 431—rotating shaft; 44—bevel gear I;45—bevel gear II; 451—grinding head rod; 5—silencer; 51—inner pipeline;511—air inlet I; 512—pipeline I; 52—outer pipeline; 521—air inlet II;522—pipeline II; 523—air outlet; 6—fixing rod.

DETAILED DESCRIPTION

The technical solutions of the present invention are clearly and fullydescribed below with reference to embodiments of the present invention.Apparently, the described embodiments are merely some of the embodimentsof the present invention, but not all the embodiments. Based on theembodiments of the present invention, all other embodiments obtained bya person of ordinary skill in the art without involving an inventiveeffort shall fall within the scope of protection of the presentinvention.

A medical dental grinding apparatus provided in the present inventionincludes, as shown in FIGS. 1 and 2, an apparatus body 1, where theinterior of the apparatus body 1 is of a hollow structure, an upper endsurface of the apparatus body 1 is symmetrically provided with twoholes, and a lower end surface is designed as an opening. An airpipeline 2, a clamping mechanism 3, and a grinding mechanism 4 areprovided in the apparatus body 1. The grinding mechanism 4 is providedbelow the air pipeline 2, and the air pipeline 2 and the grindingmechanism 4 are in a same plane which is perpendicular to a plane wherethe clamping mechanism 3 is located. The air pipeline 2 includes an airinlet pipeline 21, an air outlet pipeline 22, and a U-shaped connectionpipeline 23. Lower ports of the air inlet pipeline 21 and the air outletpipeline 22 are respectively fixedly connected to two ports of theU-shaped connection pipeline 23, and upper ports respectively penetratethrough a corresponding hole on the upper end surface of the apparatusbody 1 to extend out of the apparatus body 1. An upper port of the airoutlet pipeline 22 is provided with an external thread and a silencer 5is threadedly connected to the upper port of the air outlet pipeline 22.The silencer 5 includes an inner pipeline 51 and an outer pipeline 52,where the inner pipeline 51 and the outer pipeline 52 are integrallyformed. The inner pipeline 51 includes an air inlet I 511 and a pipelineI 512 which are connected to each other. The outer pipeline 52 includesan air inlet II 521, a pipeline II 522, and an air outlet 523 which areconnected to each other. The air inlet II 521 is flared, and an innerdiameter of a front-end opening is smaller than an outer diameter of theair inlet I 511 and larger than an outer diameter of the pipeline I 512.A head end of the pipeline I 512 is communicated with the air inlet I511, and a tail end is closed. The pipeline I 512 is inserted into thepipeline II 522 through the air inlet II 521. A plurality of air holesare provided on the pipeline I 512, and the interior of the innerpipeline 51 is communicated with the interior of the outer pipeline 52through the plurality of air holes. The outer diameter of the pipeline I512 is adapted to an inner diameter of the air inlet II 521, and aninner diameter of the air inlet I 511 is larger than that of the airinlet II 521. An internal thread is provided on the air inlet I 511, andis adapted to the external thread at the upper port of the air outletpipeline 22. An airflow passes through the U-shaped connection pipeline23 from the air inlet pipeline 21 and then enters the silencer 5 fromthe port of the air outlet pipeline 22; after entering the pipeline I512 from the air inlet 1511 of the inner pipeline 51, the airflow flowsinto the interior of the pipeline II 522 of the outer pipeline 52 alongthe plurality of air holes on the pipeline I 512, and then flows out ofthe air outlet 523 of the outer pipeline 52. After the airflow passesthrough the air holes uniformly distributed on the pipeline I 512, noiseis greatly reduced, a turbulent effect on a flow direction of theairflow entering the pipeline I 512 of the inner pipeline 51 isimplemented, and the airflow is prevented from rushing, so that asilencing effect is good.

The clamping mechanism 3 includes a clamping part and a movable partfixedly connected to the clamping part. The clamping part includes aclamping body I 31, a clamping body II 32, and a hinge shaft 33. Thehinge shaft 33 penetrates through one end of the clamping body I 31 andone end of the clamping body II 32, and both ends of the hinge shaft 33are fixed to an inner wall of the apparatus body 1. A bump is providedat one end of the clamping body I 31 connected to the hinge shaft 33,and a groove adapted to the bump is provided at one end of the clampingbody II 32 connected to the hinge shaft 33. The bump is provided with athrough hole I, and two sidewalls of the groove are correspondinglyprovided with through holes II. When the clamping body I 31 and theclamping body II 32 are mounted in a matching mode, the through hole Iand the through holes II are coaxial, the hinge shaft 33 penetratesthrough the through hole I and the through holes II, and both ends ofthe hinge shaft 33 are fixed to the inner wall of the apparatus body 1.Limiting blocks 331 are fixedly provided on the hinge shaft 33, arelocated on two sides of the groove on the clamping body II 32, and havea function of fixing a position of the clamping mechanism, therebypreventing the clamping body I 31 and the clamping body II 32 frommoving on the hinge shaft 33. A port at one end of the clamping body I31 away from the hinge shaft 33 and a port at one end of the clampingbody II 32 away from the hinge shaft 33 are both arc-shaped, the portsof the clamping body I 31 and the clamping body II 32 extend out of theapparatus body through the opening of a lower end of the apparatus body1, and an elastomer is provided inside the arc-shaped ports and is asponge or rubber. The clamping body I 31 and the clamping body II 32 areboth arc-shaped and are annular as a whole when the clamping body I 31and the clamping body II 32 are closed. The clamping body I 31 and theclamping body II 32 are symmetrically arranged, the arc-shaped ports,away from the hinge shaft 33, of the clamping body 131 and the clampingbody II 32 are closed to form an elliptical or circular through hole,and a steel wire is fixed by means of the elastomer inside theelliptical or circular through hole, so as to ensure safety when usingthe apparatus. The hinge shaft 33 is located in a U-shaped opening ofthe U-shaped connection pipeline 23, and one end of the clamping body I31 and one end of the clamping body II 32 that are away from the hingeshaft 33 are located below the U-shaped connection pipeline 23. Themovable part includes a movable rod I 34 and a movable rod II 35, alower end of the movable rod I 34 is fixedly connected to the clampingbody I 31, and a lower end of the movable rod II 35 is fixedly connectedto the clamping body II 32. Push rods 36 penetrating through andextending out of the apparatus body 1 are both fixedly connected toupper ends of the movable rod I 34 and the movable rod II 35. Middleportions of the movable rod I 34 and the movable rod II 35 areelastically connected by means of a spring 37. The spring 37 under anatural state enables the clamping body I 31 and the clamping body II 32to be close to each other. The apparatus body 1 is held by a hand, andby pressing the push rods 36, the clamping body I 31 is separated fromthe clamping body II 32 for clamping the steel wire; in this case, thespring 37 is in a compressed state, after the steel wire is clamped, thepush rods 36 are loosened, the spring 37 restores to the natural state,and the clamping body I 31 and the clamping body II 32 are close to eachother to clamp the steel wire.

The grinding mechanism 4 includes the turbine fan 41, a geartransmission assembly, and a plurality of grinding heads. A fixing platefor fixing the grinding mechanism 4 is provided in the apparatus body 1.The turbine fan 41 is rotatably provided on the inner bottom of theU-shaped connection pipeline 23, a main rotating shaft 411 is connectedto a lower portion of the turbine fan 41, and a lower end of the mainrotating shaft 411 penetrates through the U-shaped connection pipeline23 and the fixing plate to be connected to the gear transmissionassembly. The gear transmission assembly includes a gear I 42, two gearsII 43 meshed with the gear I 42 and uniformly distributed along aperipheral side of the gear I 42, two bevel gears I 44, and two bevelgears II 45 fixed in the apparatus body 1 by means of fixing rods 6 andrespectively meshed with the bevel gears I 44. An upper end of the gearI 42 is connected to the main rotating shaft 411, a rotating rod 421 isfixedly connected to a lower end, and a grinding head I is fixedlymounted at a bottom end of the rotating rod 421, is a concave grindinghead, and is provided with a dust-storage hole. Upper ends of the gearsII 43 are rotatably fixed to the fixing plate, and lower ends are bothconnected to the bevel gears I 44 by means of rotating shafts 431. Thebevel gears I 44 are meshed with the bevel gears II 45. The bevel gearII 45 has an end rotatably connected to the fixing rod 6 fixed in theapparatus body 1, and the other end fixedly connected to a grinding headrod 451. A top end of the grinding head rod 451 is provided with agrinding head II, a radius of a top end of the grinding head II issmaller than a root radius thereof, and the top end of the grinding headII is provided with a dust-storage hole. The grinding head II is located0.2-0.5 mm below the grinding head I. A central axis of the rotating rod421 is parallel to that of the rotating shaft 431, and an included angleof 60-80° is formed between the central axis of the rotating shaft 431and a central axis of the corresponding grinding head rod 451. Theturbine fan 41 is driven by high-pressure air to rotate, so that thegear I 42 connected to the turbine fan 41 by means of the main rotatingshaft 411 operates, the operation of the gear I 42 drives the rotatingrod 421 to rotate, and the grinding head I fixedly mounted at a bottomend of the rotating rod 421 starts grinding; meanwhile, the two gears II43 meshed with the gear I 42 both start rotating, and the bevel gears I44 connected to the lower ends of the gears II 43 by means of therotating shaft 431 also start operating; at the same time, the bevelgears II 45 meshed with the bevel gears I 44 operate, the operation ofthe bevel gears II 45 drives the grinding head rod 451 fixedly connectedto the bevel gears II 45 to rotate, and the grinding head II provided onthe top end of the grinding head rod 451 starts grinding.

According to the present invention, during use of the medical dentalgrinding apparatus, the high-pressure air is introduced into the airinlet pipeline 21; the apparatus body 1 is held by a hand, and bypressing the push rods 36, the clamping body I 31 is separated from theclamping body II 32 for clamping the steel wire having a notch; in thiscase, the spring 37 is in a compressed state, after the steel wire isclamped, the push rods 36 are loosened, the spring 37 restores to thenatural state, and the clamping body I 31 and the clamping body II 32are close to each other to clamp the steel wire. The turbine fan 41 inthe U-shaped connection pipeline 23 is driven by the high-pressure airto operate, so that the gear I 42 connected to the turbine fan 41 bymeans of the main rotating shaft 411 operates, the operation of the gearI 42 drives the rotating rod 421 to rotate, and the grinding head Ifixedly mounted at the bottom end of the rotating rod 421 startsgrinding; meanwhile, the two gears II 43 meshed with the gear I 42 bothstart rotating, and the bevel gears I 44 connected to the lower ends ofthe gears II 43 by means of the rotating shaft 431 also start operating;at the same time, the bevel gears II 45 meshed with the bevel gears I 44operate, the operation of the bevel gears II 45 drives the grinding headrod 451 fixedly connected to the bevel gears II 45 to rotate, and thegrinding head II provided at the top end of the grinding head rod 451starts grinding. Grinding is performed on the steel wire having thenotch so that the steel wire is smooth, and the problem of oral softtissue injury caused by a too sharp notch is avoided.

Although the embodiments of the present invention are shown anddescribed, it may be understood by a person of ordinary skill in the artthat various changes, modifications, substitutions, and variations maybe performed on these embodiments without departing from the principleand spirit of the present invention. The scope of protection of thepresent invention is defined by appended claims and equivalents thereof.

What is claimed is:
 1. A medical dental grinding apparatus, comprisingan apparatus body (1), wherein the interior of the apparatus body (1) isof a hollow structure, an upper end surface of the apparatus body (1) issymmetrically provided with two holes, and a lower end surface isdesigned as an opening; an air pipeline (2), a clamping mechanism (3),and a grinding mechanism (4) are provided in the apparatus body (1); aclamping port of the clamping mechanism (3) extends out of the apparatusbody (1) through the opening of a lower end of the apparatus body (1);the grinding mechanism (4) is located on the opening of the lower endinside the apparatus body (1); the air pipeline (2) comprises an airinlet pipeline (21), an air outlet pipeline (22), and a U-shapedconnection pipeline (23); lower ports of the air inlet pipeline (21) andthe air outlet pipeline (22) are respectively fixedly connected to twoports of the U-shaped connection pipeline (23), and upper portsrespectively penetrate through a hole on the upper end surface of theapparatus body (1) to extend out of the apparatus body (1); an upperport of the air outlet pipeline (22) is provided with an external threadand a silencer (5) is threadedly connected to the upper port of the airoutlet pipeline (22); a plane where the air pipeline (2) is located isperpendicular to a plane where the clamping mechanism (3) is located;the grinding mechanism (4) comprises a turbine fan (41) rotatablyprovided inside the U-shaped connection pipeline (23) and a plurality ofgrinding heads in transmission connection with the turbine fan; thegrinding heads are all located below the U-shaped connection pipeline(23); and when the clamping mechanism (3) clamps a notch part to beground, the clamping port thereof corresponds to a position of thegrinding head.
 2. The medical dental grinding apparatus according toclaim 1, wherein the silencer (5) comprises an inner pipeline (51) andan outer pipeline (52); the inner pipeline (51) and the outer pipeline(52) are integrally formed; the inner pipeline (51) comprises an airinlet I (511) and a pipeline I (512); the outer pipeline (52) comprisesan air inlet II (521), a pipeline II (522), and an air outlet (523); thepipeline I (512) is inserted into the pipeline II (522) through the airinlet II (521); a plurality of air holes are provided on the pipeline I(512), and the interior of the inner pipeline (51) is communicated withthe interior of the outer pipeline (52) through the plurality of airholes; an outer diameter of the pipeline I (512) is adapted to an innerdiameter of the air inlet II (521), and an inner diameter of the airinlet I (511) is larger than that of the air inlet II (521); an internalthread is provided on the air inlet I (511), and is adapted to theexternal thread at the upper port of the air outlet pipeline (22). 3.The medical dental grinding apparatus according to claim 1, wherein theclamping mechanism (3) comprises a clamping part and a movable partfixedly connected to the clamping part; the clamping part comprises aclamping body I (31), a clamping body II (32), and a hinge shaft (33);the hinge shaft (33) penetrates through one end of the clamping body I(31) and one end of the clamping body II (32), and both ends of thehinge shaft (33) are fixed to an inner wall of the apparatus body (1);the movable part comprises a movable rod I (34) and a movable rod II(35); a lower end of the movable rod I (34) is fixedly connected to theclamping body I (31), and a lower end of the movable rod II (35) isfixedly connected to the clamping body II (32); push rods (36)penetrating through and extending out of the apparatus body (1) are bothfixedly connected to upper ends of the movable rod I (34) and themovable rod II (35); and the movable rod I (34) is elastically connectedto the movable rod II (35) by means of a spring (37).
 4. The medicaldental grinding apparatus according to claim 3, wherein a bump isprovided at one end of the clamping body I (31) connected to the hingeshaft (33), and a groove adapted to the bump is provided at one end ofthe clamping body II (32) connected connected to the hinge shaft (33);the bump is provided with a through hole I, and two sidewalls of thegroove are correspondingly provided with through holes II; when theclamping body I (31) and the clamping body II (32) are mounted in amatching mode, the through hole I and the through holes II are coaxial,the hinge shaft (33) penetrates through the through hole I and thethrough holes II, and both ends of the hinge shaft (33) are fixed to theinner wall of the apparatus body (1); limiting blocks (331) are fixedlyprovided on the hinge shaft (33) and are located on two sides of thegroove on the clamping body II (32); and a diameter of the limitingblock (331) is larger than that of the through hole II.
 5. The medicaldental grinding apparatus according to claim 4, wherein a port at oneend of the clamping body I (31) away from the hinge shaft (33) and aport at one end of the clamping body II (32) away from the hinge shaft(33) are both arc-shaped; an elastomer is provided on an arc-shapedinner side of the port, and is a sponge or rubber; the spring (37) undera natural state enables the clamping body I (31) and the clamping bodyII (32) to be close to each other; the clamping body I (31) and theclamping body II (32) are both arc-shaped and are annular when theclamping body I (31) and the clamping body II (32) are closed; theclamping body I (31) and the clamping body II (32) are symmetricallyarranged; and when the clamping body I (31) and the clamping body II(32) are closed, the ports, away from the hinge shaft (33), of theclamping body I (31) and the clamping body II (32) are closed to form anelliptical or circular through hole.
 6. The medical dental grindingapparatus according to claim 3, wherein the hinge shaft (33) is locatedin a U-shaped opening of the U-shaped connection pipeline (23), and oneend of the clamping body I (31) and one end of the clamping body II (32)that are away from the hinge shaft (33) are located below the U-shapedconnection pipeline (23).
 7. The medical dental grinding apparatusaccording to claim 1, wherein the grinding mechanism (4) comprises theturbine fan (41), a gear transmission assembly, and a plurality ofgrinding heads; the turbine fan (41) is rotatably provided on the innerbottom of the U-shaped connection pipeline (23), a main rotating shaft(411) is connected to a lower portion of the turbine fan (41), and alower end of the main rotating shaft (411) penetrates through theU-shaped connection pipeline (23) to be connected to the geartransmission assembly; the gear transmission assembly comprises a gear I(42), two gears II (43) meshed with the gear I (42) and uniformlydistributed along a peripheral side of the gear I (42), two bevel gearsI (44), and two bevel gears II (45) fixed in the apparatus body (1) bymeans of fixing rods (6) and respectively meshed with the bevel gears I(44); an upper end of the gear I (42) is connected to the main rotatingshaft (411), a rotating rod (421) is fixedly connected to a lower end,and a grinding head I is fixedly mounted at a bottom end of the rotatingrod (421), is a concave grinding head, and is provided with adust-storage hole; lower ends of the gears II (43) are both connected tothe bevel gears I (44) by means of rotating shafts (431); the bevelgears I (44) are meshed with the bevel gears II (45); the bevel gear II(45) has an end rotatably connected to the fixing rod (6) fixed in theapparatus body (1), and the other end fixedly connected to a grindinghead rod (451); a top end of the grinding head rod (451) is providedwith a grinding head II, a radius of a top end of the grinding head IIis smaller than a root radius thereof, and the top end of the grindinghead II is provided with a dust-storage hole; and the grinding head IIis located 0.2-0.5 mm below the grinding head I.
 8. The medical dentalgrinding apparatus according to claim 7, wherein a central axis of therotating rod (421) is parallel to that of the rotating shaft (431), andan included angle of 60-80° is formed between the central axis of therotating shaft (431) and a central axis of the corresponding grindinghead rod (451).